This page is devoted to information on Supernova 1999bg in IC 758. Basic information on this SN, including the last reported brightness, on this Supernova can be found on the main supernova page. Information on the original web pages for many of these images can be found on the Supernova links web page.
1999bg is another discover by the Lick Observatory Supernova Search who have been very prolific over the past year but have had a bit of a lull lately. Note that there is a fairly dim H II region just to the north of the location of 1999bg. Look at the following Didier Morata image to show it's location relative that of the SN.
Web pages dedicated to this SN.
The following is a list of images of this SN, in chronological order.
Click on the name in the "observer" column to see the image.
If you know of any others, please tell me!
|Didier Morata||3/30.854/99||15.4||C||H II region location|
|3/31/99 23:13:08 JST||15.6||C|
|Kereszty Zsolt||4/3/99 20:53 UT||15.5||C|
|Paul Pinel||4/5/99 22h29m50s||15.5||C|
|4/14/99 02:19:47 JST||15.7||C|
|Rafael Ferrando image||4/17/99||15.42||C|
|4/17/99 00:52:56 JST||15.6||C|
|4/29/99 21:43:26 JST||15.6||C|
|Paul Pinel||4/30/99 22h29m||C|
Light curves and Spectra:
from [vsnet-alert 2812] SNe 1999bg and 1999bh
Dear SN watchers,
Lick Observatory Supernova Search (LOSS) team has discovered two new supernovae with KAIT, both of which can become bright. Among them, the host of SN 1999bg would be nearby one as Virgo cluster. Remarkable!
According to IAUC 7135, SN 1999bg was discovered on Mar. 28.3 at 15.5 mag. The location is R.A. = 12h04m07s.30, Decl. = +62o30'01".2 (2000.0), which is about 33" west and 20" south of the nucleus of SBcd galaxy IC 758. On Digitized Sky Survey 2 image, the spiral arm of this galaxy seems somewhat dim, and at the position of the new star there exists a diffuse condensation which would be an H II region or a accompanied galaxy.
The recession velocity of IC 758 is about 1200 km s-1, which is the same order of that of Virgo cluster. Though the local dispersion from Hubble flow would disorder the distance estimate, this can be very nearby galaxy, say, 20 Mpc order. Typical SNeIa on 20 Mpc would be 13 mag or brighter at its maximum.
1999bg can become the brightest one after SN 1998bu. Followup magnitude estimate and spectroscopy (the types has not determined for either) are extremely encouraged.
Hitoshi Yamaoka, Kyushu Univ., Japan